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Summary of significant accounting policies (Details)
¥ in Thousands, $ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
HKD ($)
Dec. 28, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Disclosure of transactions between related parties [line items]          
Place of incorporation Cayman Islands        
Particular of issued and fully paid up capital ¥ 325       ¥ 77
Chutian Financial Holdings (Hong Kong) Limited [Member]          
Disclosure of transactions between related parties [line items]          
Place of incorporation Hong Kong        
Particular of issued and fully paid up capital | $     $ 10,000    
Group's effective interest 100.00% 100.00% 100.00%    
Held by a subsidiary 100.00% 100.00% 100.00%    
Principal activities Investment holding        
True Silver Limited [Member]          
Disclosure of transactions between related parties [line items]          
Place of incorporation British Virgin Islands        
Particular of issued and fully paid up capital | $   $ 50,000      
Group's effective interest 100.00% 100.00% 100.00%    
Held by the Company 100.00% 100.00% 100.00%    
Principal activities Investment holding        
Wuhan Chutian Investment Holdings Co. Ltd [Member]          
Disclosure of transactions between related parties [line items]          
Place of incorporation PRC        
Particular of issued and fully paid up capital ¥ 3,000,000        
Group's effective interest 100.00% 100.00% 100.00%    
Held by a subsidiary 100.00% 100.00% 100.00%    
Principal activities Investment holding        
Hubei Chutian Microfinance Co., Ltd [Member]          
Disclosure of transactions between related parties [line items]          
Place of incorporation PRC        
Particular of issued and fully paid up capital ¥ 450,000,000     ¥ 450,000,000  
Group's effective interest 80.00% 80.00% 80.00%    
Held by a subsidiary 80.00% 80.00% 80.00%    
Principal activities Microfinance lenders